SU1182458A1 - Ground panel for well sound probes - Google Patents

Abstract

1. GROUND CONTROL FOR BOTTOM ACOUSTIC PROBES, including a synchronization circuit, a device for fixing the arrival time of elastic oscillations, a device for calculating the parameters of elastic oscillations, as well as a fixed interference blocking circuit and a ground-based interference blocking circuit. A synchronization circuit, a device for fixing the arrival time of elastic oscillations and a device for calculating the parameters of elastic oscillations are connected, the output of the synchronization circuit is connected to the start inputs of the fixed interference blocking circuit and the following noise blocking circuit, as well as to the start input of the device for fixing the arrival time of elastic oscillations, outputs The fixed and the following interference blocking circuits are connected to the inputs of the device for fixing the arrival time of elastic oscillations whose outputs are connected to the input of the circuit Generally blocking interference and entering the device for calculating the parameters of elastic oscillations, characterized in that, in order to increase the reliability of preventing an emergency situation in the well, an anomalous time variation detector (Line and connected to the output of the detector of the anomalous time change of the alarm device, the signal inputs of the anomalous time change detector are connected: the first is connected to the output of the fixed interlocking block circuit, the second is connected to the output of the following blocking of interferences, and sync input connected to the output of the synchronization circuit. 2. The remote control panel of claim 1, wherein the anomalous time change detector consists of a coincidence circuit, whose inputs are the signal inputs of an anomalous time change detector, and a trigger, one of whose inputs is connected to the output of the coincidence circuit, and the second is sync detector input.

Description

The invention relates to devices for geophysical surveys of a geological section of wells by an acoustic method and can be used in acoustic well maps. The purpose of the invention is to increase the reliability of preventing an emergency situation in a well. FIG. i depicts a block diagram of a ground control panel; in fig. 2 - stress diagrams for normal descent of the probe; FIG. 3 is the same when the bottom of the probe is stopped; Fig, 4. the position of the component parts of the probe during normal descent; in fig. 5 - the same, when stopping its lower part. The ground console consists of synchronization circuit 1, a fixation device 2 for the arrival time of elastic oscillations, fixed 3 circuits and 4 interlocking interference blocks, a device for calculating the elastic oscillation parameter 5, and an anomalous time variation detector 6, consisting of the coincidence circuit 7 and trigger 8, and alarm devices 9. The signal inputs of the detector b, which are simultaneously the signal inputs of the coincidence circuit 7, are connected: one to the output of the fixed 3 circuit, the second to the front of the following 4 locking circuit. One of the inputs of the trigger 8 is connected to the coincidence circuit 1 and the second input, being the synchronization input of the detector 6, is connected to the output of synchronization circuit 1. The code of synchronization circuit 1 is also connected to the trigger inputs of the fixed 3 and next 4 locks with the device fixing 2 times of arrival of elastic vibrations. In the process of logging, the information signal 10 in the form of a packet of oscillations corresponding to the elastic wheels of the baths arriving at the probe time of the acoustic probe to the receiver of the probe, together with the synchro pulse 115 corresponding to the time of excitation of the probe emitter, enters the cable ground control, where the sync pulse has a synchronization scheme 1 ,. and the information signal is fed to the information input 582 of the fixation device 2 of the arrival time of the elastic oscillations and to the device for calculating the parameters of the elastic oscillations 5. The temporal position of the information signal, i.e. its delay relative to the moment of excitation is determined by the ratio of the distance between the emitter and receiver of the probe (probe distance) to the speed of propagation of elastic oscillations in the environment. . With the probe distance set for this probe, the arrival time of the information signal relative to the sync pulse varies depending on the propagation speed of the elastic oscillations in the rocks passed by the probe. With dense rocks, where the speed is maximum, this time has a minimum value, and with loose rocks - respectively, the maximum value. The range of times from minimum to maximum determines the waiting interval of the information signal. The control inputs of the locking device 2 are received by rectangular pulses 12 from the output of the fixed circuit and rectangular pulses 13 from the output of the following interference blocking circuit. The duration of the pulse 12 of the fixed interlocking circuit corresponds to the time interval located in the zone of interference associated with the transmission of clock pulses, and adjacent to the very close to the beginning of the sleep interval of the information signal. The duration of the pulse 13 of the locking circuit is not constant, it changes, it monitors the arrival time of the information signal, lagging behind this time by about 40 ISS, and tracking is carried out due to feedback in the circuit: the output of the locking device 2 is control the input of circuit 4 is follow block. The effect of fixation device 2 on feedback on circuit 4 of the following blocking, respectively, on the duration of the output pulse 13 depends on the recorded arrival time of the information signal in the preceding clock cycle (a little different from the expected

the arrival time of the signal in the present clock).

The impulse at the output of the fixation device 2, the arrival time of elastic oscillations, appears at each step when a signal arrives at its information input, which exceeds the device's response time, but not earlier than the pulses 12 and 13 of the fixed and following locks end. This prevents interference to interference in the interval from the sync pulse to the leading edge of the pulse 13. However, the probability of interference in an unprotected relatively small interval (40 µs) between the falling edge of the pulse 13 of the servo lock circuit and the time of arrival of the information signal is small.

11pulse from the output of the fixation device 2 elastic oscillations as a mark of the moment of fixation of the information signal arrives. The second information input of the device for calculating the parameters of elastic oscillations 5.

Pulse 12 from the output of the fixed interlocking circuit and pulse 14, corresponding to the trailing edge of the impulse 13, from the second output of the locking interlock circuit arrive at the inputs of the coincidence circuit 7, which are the signal inputs of the anomalous time detector 6. Under normal descent, when the cable insert of the acoustic probe with a flexible connection of the receiving and radiating part of the probe is in a tensioned state and the probe distance corresponds to the set value, the change in the arrival time of the information signal occurs normally, i.e. within the waiting interval. In this case, pulse 14 from the trailing edge of pulse 13, which follows the information signal, cannot fall into the time interval of pulse 12 (even when the probe passes through the most dense rocks) and therefore does not pass to the output of the coincidence circuit 7.

When stopping or braking the lower part of the probe, when the upper part of the probe begins to approach the lower part, the distance between the emitter and receiver (probe distance) decreases, due to

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This causes an anomalous change (decrease) in the time of arrival of elastic oscillations, in which the information signal 10, approaching 5 sync pulse 11, falls outside the interval of waiting for the signal corresponding to the normal probe distance. Next to the information signal 10 rear

0 the front of the pulse 13 of the blocking circuit and, accordingly, the pulse 14 at its output, in this case, falls within the interval of the pulse 12 of the fixed blocking circuit, and

5 at the output of the coincidence circuit 7 of the detector 6 an abnormal time change from the input pulse 14 appears {pulse 15, which overturns connected to the output of the circuit

Q coincidence trigger 8. At the output of the trigger 8 and, accordingly, the output of the detector 6, a voltage differential 16 appears, triggering the alarm device 9, and

5, the trigger 8 is switched to the initial state by the sync pulse of the next clock cycle.

When the alarm device is triggered, a light indicator on the console is activated to draw the operator’s attention and an acoustic signal is sent to the elevator operator’s cabin to urgently stop the descent and take the necessary measures to eliminate the possibility of an emergency, including stopping the logging and developing the well to facilitate the descent of the probe. When using a software-controlled 1 logging station, the sound signal is duplicated by the corresponding command for the computer controlling the work station; I

j Using the invention at least several times will reduce the likelihood of an emergency occurring when the separated parts of the acoustic parts approach each other.

probes with a flexible connection, and thereby eliminate the possible unproductive material costs due to simple wells and the need to ensure

5 for the elimination of accidents, as well as for

expense of wireline damage or loss (s) in the well of the probe itself.

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Claims (2)

1. A terrestrial remote control for downhole acoustic probes, including a synchronization circuit, a device for recording the time of arrival of elastic vibrations, a device for calculating the parameters of elastic vibrations, as well as a fixed jamming blocking circuit and a tracking jamming circuit, while a synchronization circuit and a locking device are connected to the input of the ground panel the time of arrival of elastic vibrations and a device for calculating the parameters of elastic vibrations, the output of the synchronization circuit is connected to the inputs of the start circuit of a fixed jamming circuit and the tracking jamming lock circuit, as well as to the start input of the device for fixing the time of arrival of elastic vibrations, the outputs of the fixed and tracking jamming circuits are connected to the inputs of the device for fixing the time of arrival of elastic vibrations, the outputs of which are connected to the input of the tracking circuit of jamming of noise and the input of the parameter calculation device elastic vibrations, characterized in that, in order to increase the reliability of preventing an emergency in the well, an abnormal change detector is additionally introduced into the ground control panel Nia time and connected to the output of the detector changes abnormal signaling device time, wherein the detector signal inputs connected to the time of abnormal change: the first - to the output of a fixed interlock circuit noise, the second - to the output of the servo locking noise, and the clock input connected to the output of the clock circuit. 2. Remote pop. 1, characterized in that the anomalous time change detector consists of a coincidence circuit, the inputs of which are the signal inputs of the anomalous time change detector, and a trigger, one of whose inputs is connected to the output of the coincidence circuit, and the second is the detector synchronization input. S_U.,., 1 182458